Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#include <algorithm>
+
#include "canvas/poly_line.h"
+#include "canvas/canvas.h"
+#include "canvas/utils.h"
using namespace ArdourCanvas;
-PolyLine::PolyLine (Group* parent)
- : Item (parent)
- , PolyItem (parent)
+PolyLine::PolyLine (Canvas* c)
+ : PolyItem (c)
+ , _threshold (1.0)
{
+}
+PolyLine::PolyLine (Item* parent)
+ : PolyItem (parent)
+ , _threshold (1.0)
+{
}
void
}
}
+void
+PolyLine::set_steps (Points const & points, bool stepped)
+{
+ if (!stepped) {
+ PolyItem::set(points);
+ return;
+ }
+
+ Points copy;
+ for (Points::const_iterator p = points.begin(); p != points.end();) {
+ Points::const_iterator next = p;
+ ++next;
+
+ copy.push_back(*p);
+ if (next != points.end() && next->x != p->x) {
+ copy.push_back(Duple(next->x, p->y));
+ }
+
+ p = next;
+ }
+
+ PolyItem::set(copy);
+}
+
bool
PolyLine::covers (Duple const & point) const
{
- Duple p = canvas_to_item (point);
+ Duple p = window_to_item (point);
const Points::size_type npoints = _points.size();
Points::size_type j;
/* repeat for each line segment */
-
+
+ const Rect visible (window_to_item (_canvas->visible_area()));
+
for (i = 1, j = 0; i < npoints; ++i, ++j) {
- /* compute area of triangle computed by the two line points and the one
- we are being asked about. If zero (within a given tolerance), the
- points are co-linear and the argument is on the line.
+ Duple at;
+ double t;
+ Duple a (_points[j]);
+ Duple b (_points[i]);
+
+ /*
+ Clamp the line endpoints to the visible area of the canvas. If we do
+ not do this, we may have a line segment extending to COORD_MAX and our
+ math goes wrong.
*/
-
- double area = fabs (_points[j].x * (_points[j].y - p.y)) +
- (_points[i].x * (p.y - _points[j].y)) +
- (p.x * (_points[j].y - _points[i].y));
- if (area < 0.001) {
+
+ a.x = std::min (a.x, visible.x1);
+ a.y = std::min (a.y, visible.y1);
+ b.x = std::min (b.x, visible.x1);
+ b.y = std::min (b.y, visible.y1);
+
+ double d = distance_to_segment_squared (p, a, b, t, at);
+
+ if (t < 0.0 || t > 1.0) {
+ continue;
+ }
+
+ if (d < _threshold + _outline_width) {
return true;
}
+
}
-
+
return false;
}
+
+void
+PolyLine::set_covers_threshold (double t)
+{
+ _threshold = t;
+}